Basic Electrical Engineering Question Bank Pdf

Analog Electronics

Alternators

Amplifiers With Negative Feedback

A.C Fundamentals, Circuits and Circuit Theory

Alternating Current and Voltage

Branch, Loop and Node Analyses

Capacitors

Control Systems

Current Electricity

D.C. Generators

D.C. Motors

Electronics

Electromagnetic Field Theory

Electromagnetic Induction

Electrical Engineering Materials

Electronics and Instrumentation

Electrical Machine Design

Electronic Devices and Circuits

Earthing or Grounding

Electric Traction

Electrical Cables

Electrical Control Systems

Electrical Inductors

Electrolysis and Storage of Batteries

Electrostatics

Energy and Power

Economics of Power Generation

FET(Field Effect Transistors)

Heating and Welding

Hybrid Parameters

Integrated Circuits

Industrial Drivers

Materials and Components

Magnetism and Electromagnetism

Modulation and Demodulation

Measurement and Instrumentation

Microprocessors

Magnetic Circuit

Microwave Communication

Multistage Transistor Amplifiers

Networks Analysis and Synthesis

Power Electronics

Polyphase Induction Motors

Parallel Circuits

Power Plant Engineering in EE

Passive Filters

Regulated DC Power Supply

Radio Receivers

RL Circuits

RC Circuits

RLC Circuits and Resonance

Rectifiers and Converters

Satellite Communication

Ohms Law

OP amp

Oscillators

Switchgear Protections

Single Stage Transistor Amplifiers

Synchronous Motors

Semiconductor Theory

Semiconductor Diode

Silicon Controlled Rectifiers

Series Circuits

Series Parallel Circuits

Solid State Switching Circuits

Single Phase Induction Motors

Time Response of Reactive Circuits 

Transistors

Transistor Audio Power Amplifiers

Three Phase Systems In Power Applications

Transformers

Transmission and Distribution 

Theorems and Conversions

Theorems In Ac Analysis

Voltage, Current and Resistance 

Here are some multiple choice questions and answers in electrical engineering:

1. What is Ohm's law? a) V = IR b) P = IV c) I = V/R d) V = I^2R

Answer: a) V = IR

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2. What is the unit of electrical resistance? a) Ohm b) Ampere c) Volt d) Watt

Answer: a) Ohm

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3. What is a diode? a) A two-terminal electronic component b) A type of battery c) A type of motor d) A type of generator

Answer: a) A two-terminal electronic component

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4. What is the purpose of a capacitor in an electrical circuit? a) Store electrical energy b) Convert AC to DC c) Increase voltage d) Decrease current

Answer: a) Store electrical energy

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5. What is the purpose of an inductor in an electrical circuit? a) Store electrical energy b) Convert AC to DC c) Increase voltage d) Decrease current

Answer: a) Store electrical energy

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1. Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law? a) Capacitors b) Inductors c) Transistors d) Resistance Answer: c (Transistors) Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. However, this law is only applicable to linear electrical components, such as resistors. Non-linear components like transistors cannot be analyzed using Ohm's law as their electrical behavior is more complex

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1. Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law?

a) Capacitors

b) Inductors

c) Transistors

d) Resistance

View Answer

Answer: c

Explanation: Ohm’s law cannot be used for unilateral networks as such networks only allow current flow in one direction. Transistor forms a unilateral network. Thus, Ohm’s law cannot be used on Transistors.

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2. What is constant for a charged spherical shell according to basic electrical energy?

a) Electrical potential outside the spherical shell

b) Electrical potential inside the spherical shell

c) Electrical field outside the spherical shell

d) Electrical field inside the spherical shell

View Answer

Answer: b

Explanation: According to principles of electrical energy, the electrical potential inside the spherical shell is constant and is represented as V = kq/R where k = 1/4πεo. This potential is the same as that of the potential on the surface of the sphere.

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3. Where does electro-static shielding occur in a charged spherical shell?

a) When electrical potential outside spherical shell is zero

b) When electrical potential inside the spherical shell is zero

c) When electrical field outside the spherical shell

d) Electrical field inside the spherical shell

View Answer

Answer: d

Explanation: The electrical field inside the spherical shell is zero and this is basically known as electrostatic shielding. The electric field outside the sphere is inversely proportional to the square of the radius.

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4. Which of the following is a correct representation of peak value in an AC Circuit?

a) RMS value/Peak factor

b) RMS value*Form factor

c) RMS value/Form factor

d) RMS value*Peak factor

View Answer

Answer: d

Explanation: A peak factor in an AC circuit represents the ratio of the peak value to the RMS value. The peak factor also called the crest factor indicates how extreme the peaks are present in a waveform.

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5. Which of the following according to fundaments of electrical energy is correct about alternating current?

a) Frequency is zero

b) Magnitude changes with time

c) Can be transported to larger distances with less loss in power

d) Flows in both directions

View Answer

Answer: a

Explanation: An alternating current changes its value with time and flows in both directions. The loss in power is less due to alternating current properties and thus, can be transported to larger distances.

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6. How many cycles will an AC signal make in 2 seconds if its frequency is 100 Hz?

a) 50

b) 100

c) 150

d) 200

View Answer

Answer: d

Explanation: In electrical engineering, the frequency represents the ratio of the number of cycles to the total time. Since frequency is given as 100 Hz and the time is 2 sec thus a total of 200 cycles will be made.

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7. What will be the direction of the drift velocity of electrons change with respect to the electric field?

a) same as that of electric field

b) opposite to that of electric field

c) perpendicular to that of the electric field in a positive direction

d) perpendicular to that of the electric field in a negative direction

View Answer

Answer: b

Explanation: Basically drift velocity can be said to be the average velocity obtained by the free electrons in metal when an electric field is applied. The direction of drift velocity for the electrons present in metal will be opposite to that of the applied electric field.

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8. What will be the current density of metal if a current of 30A is passed through a cross-sectional area of 0.5m2?

a) 7.5 A/m2

b) 15 A/m2

c) 60 A/m2

d) 120 A/m2

View Answer

Answer: c

Explanation: Current density is the ratio of the current flowing in a cross-sectional area. If a current of 30A is passed through a cross-sectional area of 0.5m2.

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9. Which of the following is correct about the power consumed by R1 and R2 connected in series if the value of R1 is greater than R2?

a) R1 will consume more power

b) R2 will consume more power

c) R1 and R2 will consume the same power

d) The relationship between the power consumed cannot be established

View Answer

Answer: a

Explanation: In the electrical engineering introduction it is explained that the power can be expressed as P = I2*R. When two resistors are connected in series the current flowing through the resistors is the same and thus, power consumed by the larger resistor will be more.

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10. What is zero for a charged spherical shell?

a) Electrical potential outside the spherical shell

b) Electrical potential inside the spherical shell

c) Electrical field outside the spherical shell

d) Electrical field inside the spherical shell

View Answer

Answer: d

Explanation: According to the fundamentals of the electrical field inside the spherical shell is zero and this is known as electrostatic shielding. The electric field outside the sphere is inversely proportional to the square of the radius.

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11. What kind of quantity is an Electric potential?

a) Vector quantity

b) Tensor quantity

c) Scalar quantity

d) Dimensionless quantity

View Answer

Answer: c

Explanation: Electric potential refers to the work done to bring a unit positive charge from a point with higher potential to a point with lower potential. Since electric potential only has magnitude but no direction, it is a scalar quantity.

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12. What do crowded lines of force indicate?

a) Strong electric field

b) Weak electric field

c) Strong electric potential

d) Weak electric potential

View Answer

Answer: a

Explanation: According to the principles of electric fields, when crowded lines of field are present the electric fields are very strong. The strong electric field can be witnessed near the poles of a magnet as the lines of force are crowded in this region.

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13. What is the direction of the electric field at a point?

a) Along the line perpendicular to the electric field

b) Along the line tangent to the electric field

c) Electric field has no direction

d) Electric field has a random direction

View Answer

Answer: b

Explanation: According to the basics of the Electric field, it is a vector quantity and has a direction. The direction of the electric field is said to be along the line tangent to the electric field.

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14. What is the magnitude of mutually induced emf, E2 in a transformer?

a) directly proportional to rate of change of flux and number of secondary turns

b) inversely proportional to rate of change of flux and number of secondary turns

c) proportional to rate of change of flux and inversely proportional to number of secondary turns

d) inversely proportional to the rate of change of flux and proportional to number of secondary turns

View Answer

Answer: a

Explanation: Due to the supply voltage, a secondary induced emf is produced. V1 is in antiphase with E2 and the magnitude of E2 is proportional to rate of change of flux and number of secondary turns.

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15. Which of the following will happen in a transformer when the number of secondary turns is less than the number of primary turns?

a) The voltage gets stepped up

b The voltage gets stepped down

c) The power gets stepped up

d) The power gets stepped down

View Answer

Answer: b

Explanation: The voltage transformation ratio is basically the ratio of the number of secondary turns to that of the number of primary turns. When the transformation ratio is less than 1, the step-down operation occurs.

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16. What is the number of primary turns in a 200/1000 V transformer if the emf per turn is 10V?

a) 5

b) 10

c) 20

d) 40

View Answer

Answer: c

Explanation: The number of primary turns is the ratio of induced emf in the primary to the emf induced per turn. Thus, the number of primary turns in a 200/1000 V transformer with emf per turn of 10V is 200/10 = 20.

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17. Which of the following is a correct representation of average value in an AC Circuit?

a) RMS value/Form factor

b) RMS value*Form factor

c) RMS value/Peak factor

d) RMS value*Peak factor

View Answer

Answer: a

Explanation: The form factor basically gives the expression for DC of equal power to a given AC. A form factor in an AC circuit represents the ratio of the RMS value to the average value. Thus, average value = RMS value/Form factor.

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18. Who defined electric current and devised a method to measure current?

a) Michael Faraday

b) Andre-Marie Ampere

c) Nikola Tesla

d) Alessandro Antonio Volta

View Answer

Answer: b

Explanation: Andre-Marie Ampere is a French physicist and mathematician who defined electric current and devised a method to measure current in the 1820s.

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19. How many electrons will constitute 2 Coulombs of electric charge?

a) 6.24 * 1018 electrons

b) 12.48 * 1018 electrons

c) 1.602 * 1019 electrons

d) 3.204 * 1019 electrons

View Answer

Answer: b

Explanation: One Coulomb of charge consists of 1/(1.602*10-19) electron that is 6.24 * 1018 electrons. A coulomb is a unit for the charge. Thus, for 2 Coulombs of charge will have 6.24 * 1018 * 2 = 12.48 * 1018 electrons.

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20. Which of the following is correct about direct current?

a) Magnitude is constant

b) Frequency is zero

c) Can be transported to larger distances with less loss in power

d) Flows in one direction

View Answer

Answer: c

Explanation: A direct current has a fixed value and does not change with time. The frequency of the direct current is equal to zero as it does not change with time.

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21. Who witnessed the effect of magnetism for the first time?

a) Hans Christian Orsted

b) Alexander Graham Bell

c) Michael Faraday

d) Gustav Robert Kirchhoff

View Answer

Answer: a

Explanation: Hans Christian Orsted was a Danish physicist and chemist who witnessed the effect of magnetism for the first time. He discovered that electric current can create a magnetic field using an experiment.

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22. Which of the following according is correct about electrical conductivity?

a) It is the ratio of current density to the electric field

b) It is the product of current density and electric field

c) It is the ratio of the electric field to current density

d) It is the reciprocal of the product of current density and electric field

View Answer

Answer: a

Explanation: Electrical conductivity gives the ability of a conductor to conduct electric current. The point form of Ohm’s law says that the electrical conductivity (σ) is the ratio of current density (J) to electric field (E).

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23. What is responsible for the current to flow?

a) Protons

b) Electrons

c) Nucleus

d) Protons and Electrons

View Answer

Answer: b

Explanation: For the current to flow in a circuit electrons are required. Electrons are negatively charged and when the potential difference is applied these electrons flow to constitute a current. The current direction is opposite to the electron flow.

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24. Which of the following according to KCL must be zero?

a) Algebraic sum of currents in closed-loop

b) Algebraic sum of power in closed-loop

c) Algebraic sum of currents entering and leaving a junction

d) Algebraic sum of voltages across the input and output

View Answer

Answer: c

Explanation: KCL or Kirchhoff’s current law helps in finding the currents flowing in the circuit. KCL states that the current entering a junction is equal to the current leaving a junction.

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25. How many directions can the electric field at a point have?

a) Zero

b) One

c) Two

d) Many

View Answer

Answer: b

Explanation: Electric field is a vector quantity and has a direction. The direction of the electric field is said to be along the line tangent to the electric field. Thus, the electric field at a point has one direction.

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26. Which of the following will happen in a transformer when the number of secondary turns is greater than the number of primary turns?

a) The voltage gets stepped up

b) The voltage gets stepped down

c) The power gets stepped up

d) The power gets stepped down

View Answer

Answer: a

Explanation: The voltage transformation ratio is the ratio of the number of secondary turns to that of the number of primary turns. When the transformation ratio is greater than 1, the step-up operation occurs.

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27. Which of the following is correct about the voltage transformation ratio in electrical engineering?

a) Ratio of number of primary turns to the number of secondary turns

b) Ratio of induced emf in secondary to induced emf in primary

c) Ratio of secondary current to the primary current

d) Ratio of power in primary to power in secondary

View Answer

Answer: b

Explanation: The voltage transformation ratio is the ratio of the number of secondary turns to the number of primary turns. This can also be expressed as the ratio of induced emf in secondary to induced emf in primary or ratio of primary current to secondary current.

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28. Which of the following according to the fundamentals of electrical engineering is correct about the induced emf in primary of transformer?

a) It is the ratio of primary turns to emf induced per turn

b) It is the product of primary turns and emf induced per turn

c) It is the ratio of secondary turns to emf induced per turn

d) It is the product of secondary turns and emf induced per turn

View Answer

Answer: b

Explanation: The number of primary turns is the ratio of induced emf in the primary to the emf induced per turn. Thus, the induced emf in the primary of the transformer is the product of primary turns and emf induced per turn.

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29. Which of the following current is drawn by the primary circuit of an ideal transformer when the secondary is open?

a) Secondary current

b) Leakage current

c) Magnetizing current

d) Working on current

View Answer

Answer: c

Explanation: When the secondary is open no current flows through the load, thus no secondary current is drawn. The primary coil for an ideal transformer is purely inductive and thus, only draws magnetizing current.

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30. What does positive power in an electrical element indicate?

a) Element is absorbing power

b) Element is supplying power

c) Element may absorb or supply power

d) Element is neither absorbing nor supplying power

View Answer

Answer: a

Explanation: Power in an electrical element is the product of voltage and current. Positive power will be established when both voltage and current are positive or both are negative. Positive power will indicate that the element is absorbing power.

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31. How does induce emf in DC motor react to supply voltage?

a) It will aid the supply voltage

b) It will be double the supply voltage

c) It will oppose the supply voltage

d) It will be half of the supply voltage

View Answer

Answer: c

Explanation: Lenz’s law suggests that the direction of induced emf is such that it opposes the cause. The supply voltage will be the cause in this case. Thus induced emf will oppose the supply voltage.

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32. Which of the following type of circuits in electrical engineering cannot be analyzed using Ohm’s law?

a) Unilateral

b) Bilateral

c) Linear

d) Conductors

View Answer

Answer: a

Explanation: Ohm’s law cannot be used for analyzing unilateral networks as such networks only allow current flow in one direction. A unilateral network can consist diode, transistor, etc.

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33. Which of the following according to KVL must be zero?

a) Algebraic sum of currents in closed-loop

b) Algebraic sum of power in closed-loop

c) Algebraic sum of losses in closed-loop

d) Algebraic sum of voltages in closed-loop

View Answer

Answer: d

Explanation: KVL or Kirchhoff’s voltage law proves the law of conservation of energy around a closed path. KVL can be used in the circuit to find the circuit parameters by considering that the algebraic sum of voltages in a closed loop is zero.

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A good conductor should have

1. the resistivity must be high

2. the resistivity must be low

3. the resitivity is zero

4. the resistivity is infinitive

Option 2 : the resistivity must be low

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A fuse protects an electric circuit by which of the following?

1. Overloading

2. Current

3. Current sport 

4. Current uptake 

Option 1 : Overloading

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Which of the following is a measure of the flow of electric charge over time?

1. Power

2. Voltage

4. Current 

5. Air 

Which is not defining the unit of electric current? 

1. coulomb/sec  

2. Farad-coulomb/sec  

3. Volt/Ω 

4. ampere

Option 2 : Farad-coulomb/sec 

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A fuse protects an electric circuit by which of the following?

1. Overloading

2. Transforming one form of energy into another

3. Current sport

4. Current uptake

Option 1 : Overloading

A source of voltage V maintains a current I in a circuit. The power (P) input to the circuit by the source is given by:

1. P = V I

2. P = V/I

3. P = I/V

4. P = 1/(V I)

Option 1 : P = V I

The capacitance of capacitor is NOT influenced by

1. Plate thickness

2. Plate area

3. Plate separation

Option 1 : Plate thickness

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Ampere-hour is a unit of 

1. Quantity of electricity 

2. Strength of current 

3. Power 

4. Energy

Option 1 : Quantity of electricity

For domestic wiring purposes, how are circuits connected

1. Straight 

2. Parallel 

3. Serial 

4. Series

Option 2 : Parallel

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When three identical bulbs of 60watt, 200volt rating are connected in series to a 200volt supply, the power drawn by them will be 

1. 180 watt 

2. 10 watt

3. 20 watt

4. 60 watt

Option 3 : 20 watt

Which of the following is a measure of the flow of electric charge over time?

1. Power

2. Voltage

3. Energy

4. Current

The correct answer is  Option 4 : Current

A dynamo is sometimes said to generate electricity. It actually acts as a source of

1. charge

2. magnetism

3. energy

The correct answer is  Option 3 : energy

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Conduction of current in both directions in an element (example: Resistance; Inductance; Capacitance) with the same magnitude is termed as ______.

1. bilateral element

2. passive element

3. active element

4. unilateral element

The correct answer is option 1):(bilateral element)

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1.  In gases the flow of current is due to

A. Electrons only

B. Positive ions only

C. Electrons and positive ions

D. Electrons, positive ions and negative ions

View Answer

D. Electrons, positive ions and negative ions

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2.  The flow of current in solids is due to

A. Electrons

B. Electrons and ions

C. Atoms

D. Nucleus

View Answer

A. Electrons

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3.  The minimum requirements for causing flow of current are

A. A voltage source, a resistor and a switch

B. A voltages source and a conductor

C.. A power source and a bulb

D. A voltage source, a conductor an ammeter and a switch

✔ View Answer

B. A voltages source and a conductor

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4.  An instrument which detects electric current is known as

A. Voltmeter

B. Rheostat

C. Wattmetre

D. Galvanometer

✔ View Answer

D. Galvanometer

5.  Electric pressure is also called

A. Resistance

B. Power

C. Voltage

D. Energy

✔ View Answer

C. Voltage

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6. Which of the following ampere-second could be the unit?

A. Reluctance

B. Charge

C. Power

D. Energy

✔ View Answer

B. Charge

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7. The rating of the fuse wire is always expressed in

A. Ampere-hours

B. Ampere-volts

C. KWH

D. Ampere

✔ View Answer

D. Ampere

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8. The S.I. unit of power is

A. Henry

B. Coulomb

C. Watt

D. Watt-hour

✔ View Answer

C. Watt

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9. Temperature coefficient of resistance is expressed in terms of

A. Ohms/oC

B. Mhos/ohmoC

C. Ohms/ohmoC

D. Mhos/oC

✔ View Answer

C. Ohms/ohmoC

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10. One newton metre is same as

A. One watt

B. 1 joule

C. 5 joules

D. 1 joule/sec

✔ View Answer

B. 1 joule

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11. Which of the following materials has the least resistivity?

A. Zinc

B. Lead

C. Mercury

D. Copper

✔ View Answer

D. Copper

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12. Which of the following can have negative temperature coefficient ?

A. Compounds of silver

B. Liquid metals

C. Metallic alloys

D. Electrolytes

✔ View Answer

D. Electrolytes

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13. Which of the following method can be used for absolute measurement of

resistance?

A. Lorentz method

B. Releigh method

C. Ohm's law method

D. Wheatstone bridge method

✔ View Answer

D. Wheatstone bridge method

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14. Which of the following does not have negative temperature co-efficient ?

A. Aluminium

B. Paper

C. Rubber

D. Mica

✔ View Answer

A. Aluminium

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15. Which is the best conductor of electricity?

A. Iron

B. Silver

C. Copper

D. Carbon

✔ View Answer

B. Silver

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16. The filament of an electric bulb is made of

A. Carbon

B. Aluminium

C. Tungsten

D. Nickel

✔ View Answer

C. Tungsten

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17. Which of the following materials has a negative temperature coefficient of

resistance?

A. Copper

B. Aluminium

C. Carbon

D. Brass

✔ View Answer

C. Carbon

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18. Which of the following material has nearly zero temperature coefficient of

resistance?

A. Manganin

B. Porcelain

C. Carbon

D. Copper

✔ View Answer

A. Manganin

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19. The substance which have a large number of free electrons and offer a

resistance are called

A. Insulators

B. Inductors

C. Semiconductors

D. Conductors

✔ View Answer

D. Conductors

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20. The resistance of human body is around

A. 50 Ohms

B. 25 Ohmes

C. 250 Ohms

D. 1000 Ohm's

✔ View Answer

D. 1000 Ohm's

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21. 1 Coulomb charge equals the charge on

A. 6.24 x 1012 electrons

B. 6.24 x 1014 electrons

C. 6.24 x 1016 electrons

D. 6.24 x 1018 electrons

✔ View Answer

D. 6.24 x 1018 18 electrons

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22. The resistance of a conductor varies inversely as

A. Length

B. Area of cross-section

C. Temperature

D. Resistivity

✔ View Answer

B. Area of cross-section

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23. With rise in temperature the resistance of pure metals

A. Increases

B. Decreases

C. . First increases and then decreases

D. Remains constant

✔ View Answer

A. Increases

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24. With the rise in temperature the resistance of semiconductors

A. Increases

B. Decreases

C. First increases and then decreases

D. Remains constant

✔ View Answer

B. Decreases

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25. The property of the conductor due to which it passes current is called

A. Resistance

B. Reluctance

C. Conductance

D. Inductance

✔ View Answer

C. Conductance

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26.  Resistance of a wire always increases if

A. Temperature is reduced

B. Temperature is increased

C. Number of free electrons available become less

D. Number of free electrons available become more

✔ View Answer

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31. A closed switch has a resistance of

A. Zero

B. About 50 ohms

C. About 500 ohms

D. Infinity

✔ View Answer

A. Zero

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32. Who in one leg of parallel circuit is opened out the total current will

A. Reduce

B. Increase

C. Decrease

D. Become zero

✔ View Answer

C. Decrease

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33. Which of the following quantities remain the same in all parts of a series circuit?

A. Voltage

B. Current

C. Power

D. Resistance

✔ View Answer

B. Current

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34. Heat in a conductor is produced on the passage of electric current due to

A. Reactance

B. Capacitance

C. Impedance

D. Resistance

✔ View Answer

D. Resistance

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35. The insulation on a current carrying conductor is provided

A. To prevent leakage of current

B. To prevent a shock

C. Both of the above

D. None of the above

✔ View Answer

C. Both of the above

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27.  Pure metals generally have

A. High conductivity and low temperature coefficient

B. High conductivity and large temperature coefficient

C. Low conductivity and zero temperature coefficient

D. Low conductivity and high-temperature coefficient

✔ View Answer

B. High conductivity and large temperature coefficient

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28.  The temperature coefficient of resistance of an insulator is

A. Positive and independent of temperature

B. Negative and independent of temperature

C. Negative and dependent on temperature

D. Positive and dependent on temperature

✔ View Answer

C. Negative and dependent on temperature

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29.  Specific resistance of a conductor depends upon

A. Dimensions of the conductor

B. Composition of contactor material

C. Resistance of the conductor

D. Both A and B

✔ View Answer

D. Both A and B

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30.  Which of the following materials posses the least specific resistance?

A. Aluminium

B. Copper

C. Silver

D. Iron

✔ View Answer

C. Silver

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36. A field of force can exist only between

A. Two molecules

B. Two ions

C. Two atoms

D. Two metal particles

✔ View Answer

B. Two ions

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37. Balbs in street lighting are all connected in

A. Parallel

B. Series

C. Series-parallel

D. End to end

✔ View Answer

A. Parallel

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38. Sparking occurs when a load is switched off because the circuit has high

A. Resistance

B. Inductance

C. Capacitance

D. Impedance

✔ View Answer

B. Inductance

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39. Three 6 ohms resistors are connected to from a triangle. What is the resistance

between any two corners?

A. 3/2 ohm

B. 6 ohm

C. 4 ohm

D. 8/3 ohm

✔ View Answer

C. 4 ohm

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40. Voltage dependent resistors are usually made from

A. Charcoal

B. Silicon carbide

C. Nichrome

D. Graphite

✔ View Answer

C. Nichrome

41. Two resistors are set to be connected in series when

A. Same current passes in turn through body

B. Both carry the same value of current

C. Total current equals the sum of branch currents

D. Some of I.R. drops equal the applied e.m.f.

✔ View Answer

A. Same current passes in turn through body

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42. Varistors are

A. Insulators

B. Non-linear resisters

C. Carbon resistors

D. Resisters with zero temperature coefficient

✔ View Answer

B. Non-linear resisters

43. Insulating materials have the function of

A. Preventing a short circuit between conducting wire

B. Preventing an open circuit between the voltage source and the load

C. Conducting very large currents

D. Storing very high currents

✔ View Answer

A. Preventing a short circuit between conducting wire

44. The minimum charge of an ion is

A. Equal to the atomic number of the atom

B. Equal to the charge of an electron

C. Equal to the charge of the number of electrons in an atom

D. Zero

✔ View Answer

B. Equal to the charge of an electron

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45. If the efficiency of a machine is to be high, what should be low?

A. Input power

B. Losses

C. Ratio of output to input

D. All of the above

✔ View Answer

B. Losses

46. For testing appliances, the wattage of test lamp should be

A. Very low

B. Low

C. High

D. Any value

✔ View Answer

C. High

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47. In the case of direct current

A. Magnitude and direction of current remains constant

B. Magnitude and direction of current changes with time

C. Magnitude of current changes with time

D. Magnitude of current remains constant

✔ View Answer

A. Magnitude and direction of current remains constant

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48. Voltage dependent resistors are used

A. For inductive circuits

B. To suppress surges

C. An heating elements

D. As current stabilizers

✔ View Answer

B. To suppress surges

49. Which of the following could be the value of resistivity of copper ?

A. 1.72 × 10-4 Ω-m

B. 1.72 × 10-9 Ω-m

C. 1.72 × 10-6 Ω-m

D. 1.72 × 10-8 Ω-m

✔ View Answer

D. 1.72 × 10-8 Ω-m

50. Specific resistance of a substance is measured in

A. Ω/m

B. Ω/m2

C. Ω-m

D. m/Ω

✔ View Answer

C. Ω-m

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